What are the common causes of P021F?

A faulty fuel injector on cylinder 12. A short or open in the cylinder 12 injector wiring. A faulty crankshaft or camshaft position sensor. Low fuel pressure at the rail. Contaminated fuel in the system.

Compare cylinder 12 injection timing on a scan tool. Inspect the cylinder 12 injector wiring and connector. Check the crankshaft and camshaft position sensors. Check the fuel pressure and quality. Replace the cylinder 12 injector if faulty. Clear the code and retest.

P021F

Cylinder 12 Injection Timing

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P021F means Cylinder 12 Injection Timing.

Check these first

A faulty fuel injector on cylinder 12
A short or open in the cylinder 12 injector wiring
A faulty crankshaft or camshaft position sensor
Low fuel pressure at the rail
Contaminated fuel in the system

What to do next

Compare cylinder 12 injection timing on a scan tool
Inspect the cylinder 12 injector wiring and connector
Check the crankshaft and camshaft position sensors
Check the fuel pressure and quality
Replace the cylinder 12 injector if faulty
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.